Also, everything depends on what you are going to use it for. There are bagless ones, usually Wet/Dry me thinks, but not sure. They normally have a selection on display...Go do a 'Suck-Off' competition. There should be a working plug close enough to test all them 'Suckers'.

The one we have - WAP Aero 25 uses a bag. You can also buy them @ Makro. Approximately R120 for 3 bags. They are in a clear 'No Name' type bag and are usually to be found on a shelf, close to where the vacuum cleaners live.